Cutter grinding machine



Nov. 28, 1933. J. F. sTANDlsH CUTTER GRINDING MACHINE Filed Jan. 1e, 193s patented Nov. 28, 1933 assigner@ 'Pater-son,`v i

'Sones- -jfClffSl-en invention relates to a grinding' apparatus" and'pantioularly to ione adapted or sharpening 1 rotary toothed cutters of the general type ,ems played for. trimmngthe edges ofshoe. soles. I

1 .,t is .an object of the invention to lprovidez'a Y machine in which cutters-.of the aboyefnientioned gio type may; be' positioned conveniently for grind? ing the. front. faces'fof .their ,teethpa'nd incwlflieh they may. be fed against the Wheel' with assurance @that1 as the teeth are ground away by suoces.- sive sharpening operations, the shapeof the teeth Will be. substantially .unchanged .until l they Y have been ground away vto the `limit of their .useulaz ness. l

With the ab mounted to turnen an axis Whiohcoineidesgwithi .of the are, offthe; clearf being ground on; in other Words, about -tnecenter around .which thattooth.

:the .center of curvature ancefaceof the tooth wasfbaoked-.offi Y Y 5 @Another feature of the inyentiononsistsg-in locating ,the'axis of the arriageand the center of the. cutter spindle in a .plane substantially' per: pondioularfto. .thsgrinding ,nlaneloi the wheels,

thus located, and. With lthe axis andeenter of ouryature coincidingeasjpreyiously the carriage about, its axis,

or pivot to feed the cutter -.touard:thegyrheel.;V

With the parts described, turning offorif successive4 erndngalprevonts any1 Substantial change in the shape ofthe l-teethfcluring ther-v usefulliie ofthe cutter.

A further feature k of mounting ,a Stop,

after theoarrase the carriage so that it. moves.therewithW has been :positioned :for er. d

ing one tootlfl of entier, .all i of the ,remaining tneoarriase.. Furthermore, afteran .inail asiiustrnent oi the stop @been mail@ .so matteo cutter .spindle 'wll'be yS.obstantaly inthe plane reigned tovabove, no .adiustmont of :the `stop ,is

necessary when the carnage. is. adiustedor suo# cessivearndings the teetnbeoorno dull, unless a cutter of .different .style and number ofteeth yis toibo ground. -1

, Dthereaturesof the invention `consist of arouf Vsurfaces conce trio with the pivot ate bearing of the,V carriage, and located on the carriage 'and--` on its support, whichsurfaces assist the.vr carriage -pivot :holding the carriage; in position against vibration.VV andl Ain .worm o uate :hearing: suriaeespf the marriage, which."

teeth are; engaged by alongitudinallyxed ylorml Y in thesuppontI'fonthe carriage; .fThua bYillrIl-l-J ing anurledhead se'oured'to. the worm, .theanf pendicular. ,to .the jcuttenspindle; which passesf l through :thea'xisiofithe grindingwheel.; :AS illus:

Ve object in View, a feature of; the inyention consists in a movable carriageafpr. s119111 porting, angl locatingl thespindle upon whiclraout: ter is positioned for grinding,.thecarragegbeing trated this plane'A is .horizontalgjandi accordingly, the istrip'. is'. located: to preyent Sliding the. utter.;

teeth. inthe.are#.`

com; riage.may..baconyenientiyimeyed aboutits pivot,

to; niekrtnefcornerspr. the. teeth and .possibly-Ab 'come linjured;itseif.- minis improved stoiris infiltrev formV ofiathumb-nut V.that is normally nreyentcd from turning by airictiondeyice.oonsistingaof a' A* z spring pressedhallnthich mayenterqneofioneor Soi.;

nFig, liisa perspectiye:yievsnofYtheirnprrnzedl grinding apparatus;

. f .Y c Fig. 2 is aside elevation of-.theiapparatus partly: the ,invention consists iny i against which the-...Cutter isf. turned and prossedby hand Yas it is ground, on-

insection'and' f. Fig; 3 .is .a topyiew tionshown inzsec'tion.`

oiftheapparatus .ir/'J'. nthapporte.v l

1 ground isiindicatedfbythereferencetnumeral ll);

spindleflz, .diameter Voiwhiolri ,isgsueh that there is ,a l.slirlingt between the. snindlefandzthe t centerrbore. of theeutten This ...cutter spindle. 11,2. is 4boitedzin .an upright.. positionzto. a oarriage le, vzhicnis ,mounted to; swing about a piyotibolt '16., The pivotbolt lrotatiuelysecunesfthe carriagel toiasupportin'g member .18 .which is mounted .for

longitudinal ,i adjustment on ja bracket f2.0. .Een Vthis purpose,gthesupportzmernber ,1,8 is provided.

withfa tonguerzwhiohgengages aoorresoondne groove in ,fthebracket .2.0, the parts beine elamned togetherin adjustedaposition by agclalgnnng.soneuf- 24:.fhis adjustment'iurnisheslazmeans'formovf loq ingnthe. cuttentoward and fromvzthe pgrndngqiiio wheeL'according to the diameter of the wheel as it wears. ,Y

The bracket 2O is bolted to the frame of the machinein which the cutters are utilized,'in a position where it will not interfere with the use of the machine in trimming'heelsbut where the cutters may be convenientlysharpened by theAV operator of themachine. Oneof therbolts. by which the bracket is secured tothe machine is shown at 26', a positioning tongue28 being formed on the side of the bracket 20, for engagement withY a-corresponding groove onthe machine in order to provide a rigid mounting of the bracket on the machine A dished grinding wheel 30, voi" the usual vtype for grinding cutters of the kind referred to, is used, and this wheel is mounted on la shaft 32 supported in a bearing 34 formed on the bracket 20. At the opposite end of the shaft 32 isa grooved pulley 36 by which the'grinding wheelisr driven from al belt inthe usual manner.

In order-to supportthe carriage against-vibration in any 'adjusted position, it has an arcuate bearing surface 38, which cooperates with a complemental bearing surface 40 Aonthe supporting V' member 18; In order that the carriage may be turned about its pivot 16,to bring a cutter located on the cutter spindle V12 into grinding position,

the bearing surface38 is provided with worm teeth 42, whichv teeth are engaged by a worm 44 cut on a shaft 46. The shaft 46 is mounted against axial or longitudinal movement in the vsupporting member 18 by means of a nut 48 and check nut -which hold a friction washer 52 lin position on one end of the shaft and by a nurled Ithumb knob 54 pinned to the other end of the shaft 46. VV-In this manner the carriagey 14 may be adjusted micrometrically about the pivot 16 to positionfthe cutter spindle 12V and will remain in extent, ras hereinafter described.

kadjusted position without supplementary locking means during the' grinding of all of the teeth of a cutter mounted on the spindle to a predetermined Referring particularly to Fig.,3 and in accord-V ance with the invention,` the cutter spindle. 12 is :secured in such a location on the carriage 14 that,

when'any one of the teeth of al cutter is brought into Y grinding position Vby turning Athe carriage V about its axis, by means of the nurled thumb knob 54,'y the spindle 12 is so located vthat the centervof-Vcurvature oflthe peripheral, `or backed` ofi, face of thatA tooth, (or the center of the arc B-B) ,"is coincident with'the center of the pivot 16 aboutv which the carriage is turned iby the knob 54; Furthermore, in order to prevent, asv

much as possible, any change in the angles between the faces of the cutter due to successive grindings during the useful life of a cutter, with a consequent change in its cutting qualities, Athe n axis Vofthe cutter spindle 12 and the axis of-the pivot 16 of the carriage Vare bothv located `sub stantially in a plane C-Cwhich is perpendicular to the grinding plane A--A of the grinding wheel. By this arrangement, the grinding plane AA of Y the grinding Wheel is substantially tangent, during the useful life of the cutter, to two arcs, one being'the arc E--E drawn about the center of the spindle 12 and the other being the arc .D-D, drawn about the pivot 160i thecarriage. By turning the carriage 14 about its ypivot 16, (or

about the center of curvature of theperipheral clearance face of the tooth beingl ground), the

vtooth being ground Vis advanced inV its arc 'of curvature toward the grinding wheeluntil ground sufficiently. It should be understood that, when the above adjustment is made, that the cutter is fixed, relatively Vto the carriage, by a stopl and that, afterward, each tooth is brought, in succession, into this position and ground to a predetermined extent before the carriage is rer-adjusted, as will be hereinafter described.V

may be ground to a given predetermined extent, a stop 56 is provided against which a portion of a non-working face 58 of each, tooth is brought manually by clockwise rotation of the cutter, as

viewed inFig. 3, as each face of the cutter is ground. Thestop 56 is mounted on a vertical stop lpost 60'which is shouldered and secured in an upright positionl to the carriage 14 by means of a nut62l The cutteris sharpened in the usual manner vby lifting it, revolving ituntil a new non-working face 58 is nearly in contact with the stop 56,r` at the same time sliding the cutter up and down upon its spindle and advancing it clockwise (Fig. 3) until the face58 is in complete contact with the stop 56, when the front face of that tooth will have become sharpened toa predetermined extent.

14, it and its stop 56 are moved with the cutter spindle 12 when `the carriage 14 isV adjusted, by. means of the knob 54 andits connecting mecha-f In order that the stop nut l64 may remain in ad-i justed position during the grinding of a cutter or set of cutters, the threaded portion ofthe cutter spindle isgrooved longitudinally with one or more grooves 66 anda spring pressed ball`68 is located in the thumb' nut 64, being 'retained therein by a set screw 70. This ball fits-iny the f 120 .dental rotation of the nut 64 but it offers no obgroove with suiicient tightness to prevent acci# It will be noted that, be-V cause the stop post 60 is mounted on the carriage` In order that the front faces of all of the teeth jectionablev resistance to turning thenut intoa new adjusted position.y

kHaving thus described Vmy invention, 'what I claim as new anddesire to secureby llietters'Pat-v ent of the United States is: I Y

1. A machine for grinding the Afront faces ofthe teeth of 'a rotary toothed cutterin which the p'ei ripheral clearance faces fare arcuate, having, inVv combination, a grinding wheel, a Icarriage mounted to turn about anaxis, and a cutter spindle mounted on the carriage eccentric to said axis and parallel thereto and positionedfto.'bringthe center of curvature of the arcuatefperipheral clearance face of a tooth of a cutter on the spindle the front face of that tooth is in grinding position.

2. A machine for grinding the front faces of the teeth of a rotary toothed cutter'in which the peripheral clearance faces are arcuate, 'having' in combination, a grinding wheel, acarriage mount# in substantial coincidence with said axis when' ed to turn about an axis parallel tothe vgrinding f face ofr said wheel, and a cutter spindle mounted on the carriageeccentric to said axis and parallel thereto and positioned to bring the center of curvature of the arcuate peripheral clearance faceof a tooth of a cutter on the spindle in substantiall the front face of coincidence with said axis when that tooth is in grinding position.

3. A machine forlgrinding the front faces of tne- 4. A machine for grinding the front faces ofJ the teeth of a rotary toothed cutter in Which the peripheral clearance faces are arcuate, having, in f combination, a grinding Wheel, a carriage mounted to turn about an axis, and a cutter spindle mounted on the carriage parallel to said axis and offset therefrom in a plane substantially perpen' dicular to the operating plane of the grinding Wheel, and atsuch a distance from saidaxis as y to bring the center of curvature of thearcuate peripheral clearance face of a tooth of a cutter on .the cutter spindle in substantial coincidence with said axis when the front face of that tooth is iny grinding position.

5. A machine for grinding the front faces of the*V teeth of a rotary toothed cutter in which the pe- Y ripheral clearance faces are arcuate, having, in

combination, a grinding Wheel, a carriage mounted to turn about an axis, a cutter spindle mounted on the carriage eccentric to said axis and parallel thereto and positioned, when the front face of any tooth of a cutter on the spindle is in grinding position, to bring the center of curvature of the arcu ate peripheral clearance face of that tooth into substantial coincidence with said axis, and a stop alsoA mounted on the carriage against which a portion of each tooth in succession is held to determine the grinding positions for the several teeth V and permit each tooth in succession to be ground only to a predetermined extent for each adjusted' position Vof the carriage. l

6. A machine for grinding the front faces of the teeth of a rotary toothed cutter in which the peripheral clearance faces are arcuate, having, in combination, a' grinding Wheel, a carriage mounted to turn about an axis, a cutter spindle mounted on the carriage eccentric to said axis and parallel thereto and positioned, when the front face of any tooth of a cutter on the spindle is in grinding position,` to bring the center of curvature of the arcuate peripheral clearance face of that tooth into substantial coincidence with said axis, micrometric means for adjusting .f the carriage about the axis, as the teeth are worn away, to feed a clearance face in its own arc toward the Wheel forgrinding the front face of that tooth, and a stop also mounted onA the carriage'ag'ainst which a portion of each tooth in succession is held to determine the grinding positions for the several teethand permitv each tooth in succession to be ground only to a predetermined extent for each adjustedposition of the carriage. f

mamachme for grindingth fromme of, l

the teeth of a vrotary toothed cutter in which the peripheral clearance faces are arcuate, having,

in combination, a grinding Wheel, a carriage` mounted to turn about an axis, a cutter spindle mounted on the carriage eccentric to saidaxis and parallel thereto and positioned, when the front face of any tooth of a cutter on the spindle is in grinding position, to bring the centerr of rcurvature, of the arcuate peripheral clearance faceof thattooth into substantial'coincidence With said axis, a wormY and Worm gear mecha.-L I t nismfor adjusting thelcarriage about the axis, and a stop also mounted on the carriage against Veov which a portion of each tooth Ain successionl is 1 i held to determine the grindingV positions for the several teeth and permit eachtooth in succession to be, ground onlyto a predetermined extent for each adjusted positionof the'carr'iage.

8. A machine for grinding the teeth of a rotary cutter having in combination, a grndingwheel, a carriage mounted to turn about an axisfa cutter spindle mounted on the carriage, la supporting member for the carriage,` co-operating bearing member, Worm teeth inthe bearing surface on the carriage, a longitudinally xed Worm mounted in said member to engage said teeth,A andl means by Which the Worm maybe rotated to turn the carriage about its axis. e v

' 9.v A machine for grinding the', front faces Yof the teeth of arotary toothed cutter in which the peripheral-'clearance faces are arcuate having, in combination, Va grinding Wheel, a carriage *"mounted to turn about anv axis, a cutterspindle mounted on the carriage eccentric to said axis vand parallel-thereto and positioned, when the front face of any tooth "o1" a cutter, on the spindle [is in grinding position,fto bring the center of y 1105 I surfaces -on the carriage' and the supportingA curvature of the arcuate peripheral clearance .l faceof that tooth intodsubstantial coincidence-v with said axis, saidspindle being constructed and arranged to permit acuttergto turn and `slide thereon while it is being ground, means "to-limit' the turning to permit each toothto4 be. ground only to the same predeterminedextent, a stopI to limit the sliding of the cutter across `the grind,

ing Wheel beyond an axial planeof the wheel perpendicular to the cutter spindia'and friction position VWhile Vpermitting re-adjustment.

e JOHN F. s'rrutriisn.l ,y l

ss j

V means on the stop to maintain it in adjusted 

